gitea/vendor/github.com/denisenkom/go-mssqldb/conn_str.go

453 lines
11 KiB
Go

package mssql
import (
"fmt"
"net"
"net/url"
"os"
"strconv"
"strings"
"time"
"unicode"
)
type connectParams struct {
logFlags uint64
port uint64
host string
instance string
database string
user string
password string
dial_timeout time.Duration
conn_timeout time.Duration
keepAlive time.Duration
encrypt bool
disableEncryption bool
trustServerCertificate bool
certificate string
hostInCertificate string
hostInCertificateProvided bool
serverSPN string
workstation string
appname string
typeFlags uint8
failOverPartner string
failOverPort uint64
packetSize uint16
}
func parseConnectParams(dsn string) (connectParams, error) {
var p connectParams
var params map[string]string
if strings.HasPrefix(dsn, "odbc:") {
parameters, err := splitConnectionStringOdbc(dsn[len("odbc:"):])
if err != nil {
return p, err
}
params = parameters
} else if strings.HasPrefix(dsn, "sqlserver://") {
parameters, err := splitConnectionStringURL(dsn)
if err != nil {
return p, err
}
params = parameters
} else {
params = splitConnectionString(dsn)
}
strlog, ok := params["log"]
if ok {
var err error
p.logFlags, err = strconv.ParseUint(strlog, 10, 64)
if err != nil {
return p, fmt.Errorf("Invalid log parameter '%s': %s", strlog, err.Error())
}
}
server := params["server"]
parts := strings.SplitN(server, `\`, 2)
p.host = parts[0]
if p.host == "." || strings.ToUpper(p.host) == "(LOCAL)" || p.host == "" {
p.host = "localhost"
}
if len(parts) > 1 {
p.instance = parts[1]
}
p.database = params["database"]
p.user = params["user id"]
p.password = params["password"]
p.port = 1433
strport, ok := params["port"]
if ok {
var err error
p.port, err = strconv.ParseUint(strport, 10, 16)
if err != nil {
f := "Invalid tcp port '%v': %v"
return p, fmt.Errorf(f, strport, err.Error())
}
}
// https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-the-network-packet-size-server-configuration-option
// Default packet size remains at 4096 bytes
p.packetSize = 4096
strpsize, ok := params["packet size"]
if ok {
var err error
psize, err := strconv.ParseUint(strpsize, 0, 16)
if err != nil {
f := "Invalid packet size '%v': %v"
return p, fmt.Errorf(f, strpsize, err.Error())
}
// Ensure packet size falls within the TDS protocol range of 512 to 32767 bytes
// NOTE: Encrypted connections have a maximum size of 16383 bytes. If you request
// a higher packet size, the server will respond with an ENVCHANGE request to
// alter the packet size to 16383 bytes.
p.packetSize = uint16(psize)
if p.packetSize < 512 {
p.packetSize = 512
} else if p.packetSize > 32767 {
p.packetSize = 32767
}
}
// https://msdn.microsoft.com/en-us/library/dd341108.aspx
//
// Do not set a connection timeout. Use Context to manage such things.
// Default to zero, but still allow it to be set.
if strconntimeout, ok := params["connection timeout"]; ok {
timeout, err := strconv.ParseUint(strconntimeout, 10, 64)
if err != nil {
f := "Invalid connection timeout '%v': %v"
return p, fmt.Errorf(f, strconntimeout, err.Error())
}
p.conn_timeout = time.Duration(timeout) * time.Second
}
p.dial_timeout = 15 * time.Second
if strdialtimeout, ok := params["dial timeout"]; ok {
timeout, err := strconv.ParseUint(strdialtimeout, 10, 64)
if err != nil {
f := "Invalid dial timeout '%v': %v"
return p, fmt.Errorf(f, strdialtimeout, err.Error())
}
p.dial_timeout = time.Duration(timeout) * time.Second
}
// default keep alive should be 30 seconds according to spec:
// https://msdn.microsoft.com/en-us/library/dd341108.aspx
p.keepAlive = 30 * time.Second
if keepAlive, ok := params["keepalive"]; ok {
timeout, err := strconv.ParseUint(keepAlive, 10, 64)
if err != nil {
f := "Invalid keepAlive value '%s': %s"
return p, fmt.Errorf(f, keepAlive, err.Error())
}
p.keepAlive = time.Duration(timeout) * time.Second
}
encrypt, ok := params["encrypt"]
if ok {
if strings.EqualFold(encrypt, "DISABLE") {
p.disableEncryption = true
} else {
var err error
p.encrypt, err = strconv.ParseBool(encrypt)
if err != nil {
f := "Invalid encrypt '%s': %s"
return p, fmt.Errorf(f, encrypt, err.Error())
}
}
} else {
p.trustServerCertificate = true
}
trust, ok := params["trustservercertificate"]
if ok {
var err error
p.trustServerCertificate, err = strconv.ParseBool(trust)
if err != nil {
f := "Invalid trust server certificate '%s': %s"
return p, fmt.Errorf(f, trust, err.Error())
}
}
p.certificate = params["certificate"]
p.hostInCertificate, ok = params["hostnameincertificate"]
if ok {
p.hostInCertificateProvided = true
} else {
p.hostInCertificate = p.host
p.hostInCertificateProvided = false
}
serverSPN, ok := params["serverspn"]
if ok {
p.serverSPN = serverSPN
} else {
p.serverSPN = fmt.Sprintf("MSSQLSvc/%s:%d", p.host, p.port)
}
workstation, ok := params["workstation id"]
if ok {
p.workstation = workstation
} else {
workstation, err := os.Hostname()
if err == nil {
p.workstation = workstation
}
}
appname, ok := params["app name"]
if !ok {
appname = "go-mssqldb"
}
p.appname = appname
appintent, ok := params["applicationintent"]
if ok {
if appintent == "ReadOnly" {
p.typeFlags |= fReadOnlyIntent
}
}
failOverPartner, ok := params["failoverpartner"]
if ok {
p.failOverPartner = failOverPartner
}
failOverPort, ok := params["failoverport"]
if ok {
var err error
p.failOverPort, err = strconv.ParseUint(failOverPort, 0, 16)
if err != nil {
f := "Invalid tcp port '%v': %v"
return p, fmt.Errorf(f, failOverPort, err.Error())
}
}
return p, nil
}
func splitConnectionString(dsn string) (res map[string]string) {
res = map[string]string{}
parts := strings.Split(dsn, ";")
for _, part := range parts {
if len(part) == 0 {
continue
}
lst := strings.SplitN(part, "=", 2)
name := strings.TrimSpace(strings.ToLower(lst[0]))
if len(name) == 0 {
continue
}
var value string = ""
if len(lst) > 1 {
value = strings.TrimSpace(lst[1])
}
res[name] = value
}
return res
}
// Splits a URL of the form sqlserver://username:password@host/instance?param1=value&param2=value
func splitConnectionStringURL(dsn string) (map[string]string, error) {
res := map[string]string{}
u, err := url.Parse(dsn)
if err != nil {
return res, err
}
if u.Scheme != "sqlserver" {
return res, fmt.Errorf("scheme %s is not recognized", u.Scheme)
}
if u.User != nil {
res["user id"] = u.User.Username()
p, exists := u.User.Password()
if exists {
res["password"] = p
}
}
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
host = u.Host
}
if len(u.Path) > 0 {
res["server"] = host + "\\" + u.Path[1:]
} else {
res["server"] = host
}
if len(port) > 0 {
res["port"] = port
}
query := u.Query()
for k, v := range query {
if len(v) > 1 {
return res, fmt.Errorf("key %s provided more than once", k)
}
res[strings.ToLower(k)] = v[0]
}
return res, nil
}
// Splits a URL in the ODBC format
func splitConnectionStringOdbc(dsn string) (map[string]string, error) {
res := map[string]string{}
type parserState int
const (
// Before the start of a key
parserStateBeforeKey parserState = iota
// Inside a key
parserStateKey
// Beginning of a value. May be bare or braced
parserStateBeginValue
// Inside a bare value
parserStateBareValue
// Inside a braced value
parserStateBracedValue
// A closing brace inside a braced value.
// May be the end of the value or an escaped closing brace, depending on the next character
parserStateBracedValueClosingBrace
// After a value. Next character should be a semicolon or whitespace.
parserStateEndValue
)
var state = parserStateBeforeKey
var key string
var value string
for i, c := range dsn {
switch state {
case parserStateBeforeKey:
switch {
case c == '=':
return res, fmt.Errorf("Unexpected character = at index %d. Expected start of key or semi-colon or whitespace.", i)
case !unicode.IsSpace(c) && c != ';':
state = parserStateKey
key += string(c)
}
case parserStateKey:
switch c {
case '=':
key = normalizeOdbcKey(key)
state = parserStateBeginValue
case ';':
// Key without value
key = normalizeOdbcKey(key)
res[key] = value
key = ""
value = ""
state = parserStateBeforeKey
default:
key += string(c)
}
case parserStateBeginValue:
switch {
case c == '{':
state = parserStateBracedValue
case c == ';':
// Empty value
res[key] = value
key = ""
state = parserStateBeforeKey
case unicode.IsSpace(c):
// Ignore whitespace
default:
state = parserStateBareValue
value += string(c)
}
case parserStateBareValue:
if c == ';' {
res[key] = strings.TrimRightFunc(value, unicode.IsSpace)
key = ""
value = ""
state = parserStateBeforeKey
} else {
value += string(c)
}
case parserStateBracedValue:
if c == '}' {
state = parserStateBracedValueClosingBrace
} else {
value += string(c)
}
case parserStateBracedValueClosingBrace:
if c == '}' {
// Escaped closing brace
value += string(c)
state = parserStateBracedValue
continue
}
// End of braced value
res[key] = value
key = ""
value = ""
// This character is the first character past the end,
// so it needs to be parsed like the parserStateEndValue state.
state = parserStateEndValue
switch {
case c == ';':
state = parserStateBeforeKey
case unicode.IsSpace(c):
// Ignore whitespace
default:
return res, fmt.Errorf("Unexpected character %c at index %d. Expected semi-colon or whitespace.", c, i)
}
case parserStateEndValue:
switch {
case c == ';':
state = parserStateBeforeKey
case unicode.IsSpace(c):
// Ignore whitespace
default:
return res, fmt.Errorf("Unexpected character %c at index %d. Expected semi-colon or whitespace.", c, i)
}
}
}
switch state {
case parserStateBeforeKey: // Okay
case parserStateKey: // Unfinished key. Treat as key without value.
key = normalizeOdbcKey(key)
res[key] = value
case parserStateBeginValue: // Empty value
res[key] = value
case parserStateBareValue:
res[key] = strings.TrimRightFunc(value, unicode.IsSpace)
case parserStateBracedValue:
return res, fmt.Errorf("Unexpected end of braced value at index %d.", len(dsn))
case parserStateBracedValueClosingBrace: // End of braced value
res[key] = value
case parserStateEndValue: // Okay
}
return res, nil
}
// Normalizes the given string as an ODBC-format key
func normalizeOdbcKey(s string) string {
return strings.ToLower(strings.TrimRightFunc(s, unicode.IsSpace))
}